mrclean.py

import re

# START_TOKEN = '<s>'
# END_TOKEN = '</s>'
# PADDING_TOKEN = '<pad>'

START_TOKEN = ''
END_TOKEN = ''
PADDING_TOKEN = ''

def _make_padding_sequence(seq_length):
 return ''.join([END_TOKEN] + seq_length * [PADDING_TOKEN])

def cleanup_simple_wikipedia(text, seq_length):
 pad_seq = _make_padding_sequence(seq_length)
 text = START_TOKEN + re.sub(r'\n\n', pad_seq + START_TOKEN, text) + pad_seq
 return text

def cleanup_wikipedia(text, seq_length):
 pad_seq = _make_padding_sequence(seq_length)
 text = re.sub(r'= = = (.+?) = = =\n', r'\1', text)
 lines = [line.strip() for line in text.splitlines()]
 text = START_TOKEN + re.sub(r'\n\n', pad_seq + START_TOKEN, '\n'.join(lines)[1:]) + pad_seq
 return text

def cleanup_qed(text, seq_length):
 # TODO: this should probably be padded too, but it’s difficult to detect when subtitles start and end
 # The handling of proper nouns and of parentheses isn’t perfect, but this is still an improvement over the base text
 punctuation_ex = re.compile(r'([.!?]\s*)')
 unimportant_chars_ex = re.compile(r'\(.*?\)|[.!?]')
 lines = []
 for line in text.splitlines():
 nchars = len(line)
 if nchars > 0:
 line_body = unimportant_chars_ex.sub('', line)
 f_upper = sum(c.isupper() for c in line_body) / len(line_body)
 if f_upper >= 0.5: # Mostly uppercase characters
 # Taken from https://stackoverflow.com/a/41662260
 split_on_punctuation = punctuation_ex.split(line.replace('l', 'I'))
 line = ''.join([sentence.capitalize() for sentence in split_on_punctuation])
 lines.append(line.strip())
 return START_TOKEN + '\n'.join(lines) + END_TOKEN + ''.join(seq_length * [PADDING_TOKEN])

def cleanup_extra_spaces(text):
 multiple_spaces_ex = re.compile(r'[ \t\u00A0]+')
 space_before_punctuation_ex = re.compile(r'[ \t\u00A0]([.,;!?])')
 text = multiple_spaces_ex.sub(' ', text)
 text = space_before_punctuation_ex.sub(r'\1', text)
 return text

def cleanup_bnc_spoken(text, seq_length):
 pad_seq = _make_padding_sequence(seq_length)
 text = cleanup_extra_spaces(text)
 text = START_TOKEN + re.sub(r'\n\n', pad_seq + START_TOKEN, text) + pad_seq
 return text

def cleanup_aochildes(text, seq_length):
 text = cleanup_extra_spaces(text)
 return START_TOKEN + text + _make_padding_sequence(seq_length)

def cleanup_cbt(text, seq_length):
 text = cleanup_extra_spaces(text)
 space_before_apostroph = re.compile(r"([\w\d])[ \t\u00A0](['’]\w)")
 #space_before_quote = re.compile(r"[ \t\u00A0](['’])")
 #space_after_quote = re.compile(r"([`])[ \t\u00A0]")
 #text = space_before_quote.sub(r'\1', text)
 #text = space_after_quote.sub(r'\1', text)
 text = space_before_apostroph.sub(r'\1\2', text)
 return START_TOKEN + text + _make_padding_sequence(seq_length)

def cleanup_children_stories(text, seq_length):
 # Sometimes one skipped line marks the beginning of a new story,
 # but sometimes it is present within a same story, which doesn’t
 # make it very useful for separating independent stories.
 return START_TOKEN + text + _make_padding_sequence(seq_length)

def cleanup_gutenberg(text, seq_length):
 # Overall, the text is clean, however some entries don’t seem
 # very useful, e.g. figure captions preceded by a number.
 # Not sure if we should remove them, because that would also
 # remove bullet lists which are otherwise consistent with the
 # surrounding text.
 # No start or end tokens because the text seems to be cut.
 return text + ''.join(seq_length * [PADDING_TOKEN])

def cleanup_open_subtitles(text, seq_length):
 # The text is mostly clean, apart from some subtitle credits
 # such as "Subtitles by ...".
 subtitle_credit_ex = re.compile(r'^.*subtitle.*$\n', re.MULTILINE | re.IGNORECASE)
 text = subtitle_credit_ex.sub('', text)
 return START_TOKEN + text + _make_padding_sequence(seq_length)

def cleanup_switchboard(text, seq_length):
 # No start or end tokens because the text seems to be cut.
 return text + ''.join(seq_length * [PADDING_TOKEN])